CN107425927A - Method for rapidly detecting shielding effect of wireless signal shielding device - Google Patents
Method for rapidly detecting shielding effect of wireless signal shielding device Download PDFInfo
- Publication number
- CN107425927A CN107425927A CN201710200110.6A CN201710200110A CN107425927A CN 107425927 A CN107425927 A CN 107425927A CN 201710200110 A CN201710200110 A CN 201710200110A CN 107425927 A CN107425927 A CN 107425927A
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- Prior art keywords
- signal
- frequency
- shielding
- data
- shielding device
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
- H04K3/62—Jamming involving special techniques by exposing communication, processing or storing systems to electromagnetic wave radiation, e.g. causing disturbance, disruption or damage of electronic circuits, or causing external injection of faults in the information
Abstract
A method for rapidly detecting the shielding effect of a wireless signal. In an unshielded state, acquiring the signal intensity and the spectrum track line of downlink channels of each frequency band of a communication base station in a test area through an antenna and a radio frequency receiving module, and storing the signal intensity and the spectrum track line data into a memory; opening the wireless signal shielding device, and acquiring the signal intensity and the spectrum trace of the corresponding frequency band again and storing the signal intensity and the spectrum trace into a memory; and (3) taking a difference value of the frequency sampling points corresponding to the frequency spectrum trace line when the signal in the same channel is shielded and the signal frequency spectrum trace line before shielding, comparing the magnitude of each difference value to obtain the difference value of the minimum difference value point, and judging the shielding effect and the safety magnitude of the site according to the magnitude relation between the minimum difference value and the reference point. Automatically switching and scanning all communication channels, outputting measurement results and displaying data graphs. The efficiency of detecting the shielding effect of the signal shielding device is greatly improved. The device provides an effective tool for the installation, detection and fault removal of the signal shielding device.
Description
Technical field
The present invention relates to radio detection technical field.In concerning security matters meeting-place, it will usually set up air interference device, block public
The proper communication of many mobile communications networks, it is that the meeting in meeting-place carries out security work.The present invention relates to quick, efficient, accurate inspection
The method for surveying signal shielding device shield effectiveness.
Background technology
In concerning security matters meeting-place, it will usually air interference device is set up, it is logical to block the public in the region specific time period to move
The proper communication of communication network.But the utilization of this secrecy technology must be controlled in rational yardstick, should ensure in meeting-place
Effective interference of mobile phone signal, the interference to mobile terminal outside the venue is also reduced as far as possible.For specification and instruct mobile communication
Shielding device is installed and used, and can all use the downstream signal intensity of the various communication standards of frequency spectrograph collection site before shielding, then
Shielding device is opened, the relativeness of the intensity of downstream signal and interference signal is tested using frequency spectrograph, judges shield effectiveness.This is just
It is required that in different frequency ranges, largely measure, record, correction data work.Not only workload is big, and very
Time-consuming, efficiency is very low.
The content of the invention
The purpose of the present invention is can quick and precisely to judge the screen of radio signal shielding device wireless signal in shielding area
Effect is covered, and shield effectiveness is intuitively shown on observation interface, improves the detection efficiency of signal shielding effect.
The technical scheme is that pass through each frequency range of antenna and Receiver Module collecting test intra-area communication base station
Signal intensity, the spectral trace of downlink channel, and by signal intensity maximum and spectral trace data Cun Chudao memories；Again
Radio signal shielding device is opened, gathers the signal intensity of corresponding frequency band again, spectrum trace is stored into memory；According to phase
The size of the difference of signal strength values and signal shielding front signal intensity level when being shielded with in-band signal judges the shielding at scene
Effect and safe magnitude.Automatic switchover scans whole communication channels, output measurement result, data drawing list and shown.
The main hardware structure of the present invention, which can be realized, to be included：
1) omnidirectional antenna：Wireless signal for reception space.
2) rf signal reception module：For gathering the wireless communication frequency band signal for needing to analyze, and pass through high speed analog-digital conversion
Signal is changed, and reception signal is converted into level data and feeds back to data processing module.
3) data processing module：For calculating, the data of analysis measurement module feedback, and result feedback man machine is handed over
Mutual module.
4) human-computer interaction module：Operated for interface display and user, receive the data of data processing module feedback, and will
Result after data processing is graphically shown, and receives the related operation setting of user.
The present invention hardware architecture diagram as shown in Figure 1, whole flows of the inventive method as shown in Figure 2, this
Invention concrete methods of realizing needs the following steps to complete：
Step is 1.：Non- open signal shields device state, and multiple automatically scanning measures and records each wireless communication descending frequency
Spectral trace line in road frequency bandwidth；
Step is 2.：Open signal shields device state, and multiple automatically scanning measures and records each wireless communication descending channel
Spectral trace line in frequency bandwidth；
Step is 3.：Compare open signal shielding device time-frequency spectrum trajectory with non-open signal shielding device time-frequency spectrum trajectory to exist
The power difference size of each identical sample frequency point in the channel bandwidth, difference and the reference of setting by minimal difference point
Value is compared, and judges the safe class of signal shielding effect；
Step is 4.：It is shown to according to status signal comparison diagram before and after measurement data generation shielding on observation interface.Described
Status signal comparison diagram is by the spectral trace that is scanned after the spectral trace line and signal shielding that are scanned before signal shielding before and after shielding
Line forms.
The step 1. in wireless communication descending channel frequency can customize or change range of frequency bandwidths.
The advantages of the present invention：
The present invention is by automatic technology, by a large amount of cumbersome manual testings are highly integrated, automation, drastically increases
Detection judges the operating efficiency of shield effectiveness.The inventive method includes each business frequency range of radio communication, by automatically scanning, adopts
Spectrum trace in collection band, point-by-point comparison, which obtains shielding device, opens front and rear difference, shows shield effectiveness is accurate and visual
Come.Effectively instrument is provided for the installation, detection, troubleshooting of concerning security matters meeting field shield device.
Brief description of the drawings
Fig. 1 is hardware architecture diagram.
Fig. 2 is program flow diagram.
Fig. 3 is to implement illustration after shielding.
Fig. 4 is spectral trace line chart.
Embodiment
The method of quick detection radio signal shielding effect as shown in Figure 1-2, for realizing the main hardware knot of this method
Structure as shown in figure 1, including：Omnidirectional antenna, rf signal reception module, data processing module, human-computer interaction module.
The operating process of the inventive method is shown in Fig. 2, comprises the following steps：
Step is 1.:In test zone non-open signal shielding device, data processing module to rf signal reception module according to
Secondary each frequency spectrum order in channel bandwidth before sending test shielding, it is T=400ms to determine time of measuring, determines a channel
The number of interior analysis spectrum trajectory data is N=301, and channel initial frequency is f1, cut-off frequency f2.Then data processing
Module obtains N number of signal value data Db0, Db1 ... ..., Db (N-1) on the spectral trace line of channel radio frequency receiving return,
Store data into memory, wherein Db0 is the signal power value in frequency f1, and Db (N-1) is in frequency f1+ (f2-
F1) signal power value during * (N-1)/300.
Wireless communication descending channel frequency preset reference value is 934-954MHz, 1805-1830MHz, 2010-2025MHz,
1880-1905MHz, 2320-2370MHz, 2575-2635MHz, 954-960MHz, 1830-1840MHz, 2130-2145MHz,
2300-2320MHz, 2555-2575MHz, 1840-1860MHz, 2145-2170MHz, 870-885MHz, 870-885MHz,
2370-2390MHz, 2635-2655MHz, 1860-1875MHz, 2110-2130MHz.Downlink channel frequency can customize or repair
Change range of frequency bandwidths.
Step is 2.：According to the method for step 1., device state is shielded in non-open signal, scans each pre-set channel one by one
Spectral trace line number according to and store into memory.
Step is 3.:Radio signal shielding device is opened, data processing module sends every after test shields successively to measurement module
Frequency spectrum order in individual channel bandwidth, determines time of measuring T=400ms, and the number for determining analysis spectrum trajectory data is N=
301.Obtain N number of level data Da0, Da1 ... ..., Da (N-1), by data storage on the spectral trace line that measurement module returns
Into memory.
Step is 4.：According to the method for step 3., device state is shielded in open signal, scans each pre-set channel one by one
Spectral trace line number evidence is simultaneously stored into memory.
Step is 5.:On first channel, frequency before corresponding shielding is individually subtracted in the data after signal shielding on spectral trace line
The data in trajectory are composed, obtain difference Df0=Da0-Db0, Df1=Da1-Db1 ... ..., Df (N-1)=Da (N-1)-Db
(N-1).Such as：When selection channel 934-954MHz is measured, Da0 is signal work(of the frequency in 934MHz after signal shielding
Rate value, Db0 are signal power value of the frequency in 934MHz before signal shielding, and Df0 is the performance number and signal after signal shielding
The difference of performance number before shielding, Df1 be shielding of the frequency in 934+ (954-934) * (1-1)/300=934MHz after with screen
Power difference before covering, Df (N-1) be frequency shielded in 934+ (954-934) * (N-1)/300 after with the power before shielding
Value.Signal intensity after shielding is more than the signal intensity before shielding, and playing shielded signal by signal compacting acts on.
Step is 6.:Compare Df0, Df1 ... ..., Df (N-1) size, obtain minimum value Dfmin.
Step is 7.：Dfmin is compared with judging reference grade threshold value V0 (0dBm), V1 (1dBm), V2 (3dBm) (as schemed
3), Dfmin≤V0 is judged as high risk, V0<Dfmin≤V1 is judged as excessive risk, V1<Dfmin≤V2 low-risks, V2<
Dfmin is judged as extremely low risk.
Step is 8.：Next channel, repeat step 5., step 6., step 7., complete the signal shielding effect of all channels
Judge.
Step is 9.：Test result is shown on observation interface by chart.
After the completion of whole process test, the data spectrum track before the shielding of each channel in corresponding test point can be checked
Track bar trace after line and shielding.
Mobile 3G/TD-SCDMA/ up-downgoings/(2010.000MHz -2025.000MHz) trajectory (such as Fig. 4) is checked,
Curve a is the spectral trace line after signal shielding, and curve b is the spectral trace line before signal shielding.Frequency is in f0=
Signal power value Da0 at 2010.000MHz, signal power value Da1 of the frequency at f1=2010.050MHz ..., frequency exists
Signal power value Da (N-1) at f (N-1)=2010+ (2025-2010) * (N-1)/300, by Da0, Da1 ..., Da (N-1)
Value link together and form curve a；Curve b is can obtain with identical method；According to the method for above-mentioned steps 6., by signal screen
Cover and shown (such as Fig. 4) with the minimal difference Dfmin obtained before signal shielding with moving 3G bar graph forms afterwards, all mobile communication
The difference of channel shows result (such as Fig. 4), signal shielding effect determination methods referring to step 7..
Claims (4)
- A kind of 1. method of quick detection radio signal shielding device shield effectiveness, for realizing the main hardware structure bag of this method Include：1) omnidirectional antenna：Wireless signal for reception space；2) rf signal reception module：For gathering the wireless communication frequency band signal for needing to analyze, and pass through high speed analog-digital conversion signal Conversion, is converted to level data by reception signal and feeds back to data processing module；3) data processing module：For calculating, the data of analysis measurement module feedback, and by result feedback man machine interact mould Block；4) human-computer interaction module：Operated for interface display and user, receive the data of data processing module feedback, and by data Result after processing is graphically shown, and receives the related operation setting of user；Characterized in that, this method comprises the following steps：Step is 1.：Non- open signal shields device state, and multiple automatically scanning measures and records each wireless communication descending channel frequency Spectral trace line in rate bandwidth；Step is 2.：Open signal shields device state, and multiple automatically scanning measures and records each wireless communication descending channel frequency Spectral trace line in bandwidth；Step is 3.：Compare open signal shielding device time-frequency spectrum trajectory and shield device time-frequency spectrum trajectory in the frequency with non-open signal The power difference size of each identical sample frequency point in road bandwidth, entered by the difference of minimal difference point with the reference value set Row compares, and judges the safe class of signal shielding effect；Step is 4.：It is shown to according to status signal comparison diagram before and after measurement data generation shielding on observation interface.
- 2. the method for quick detection radio signal shielding device shield effectiveness as claimed in claim 1, it is characterised in that：Step is 1. Described in wireless communication descending channel frequency be predisposed to 934-954MHz, 1805-1830MHz, 2010-2025MHz, 1880- 1905MHz, 2320-2370MHz, 2575-2635MHz, 954-960MHz, 1830-1840MHz, 2130-2145MHz, 2300- 2320MHz, 2555-2575MHz, 1840-1860MHz, 2145-2170MHz, 870-885MHz, 870-885MHz, 2370- 2390MHz, 2635-2655MHz, 1860-1875MHz, 2110-2130MHz.
- 3. the method for quick detection radio signal shielding device shield effectiveness as claimed in claim 1, it is characterised in that：The step Suddenly 1. in wireless communication descending channel frequency can customize or change range of frequency bandwidths.
- 4. the method for quick detection radio signal shielding device shield effectiveness as claimed in claim 1, it is characterised in that：Described Step 4. before and after middle shielding status signal comparison diagram by scanning after the spectral trace line and signal shielding that are scanned before signal shielding Spectral trace line forms.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710200110.6A CN107425927A (en) | 2017-03-30 | 2017-03-30 | Method for rapidly detecting shielding effect of wireless signal shielding device |
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| CN201710200110.6A CN107425927A (en) | 2017-03-30 | 2017-03-30 | Method for rapidly detecting shielding effect of wireless signal shielding device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108810952A (en) * | 2018-09-06 | 2018-11-13 | 桂林电子科技大学 | A kind of wireless communication signals interference prevention efficiency check and evaluation System and method for |
| CN110492952A (en) * | 2019-08-15 | 2019-11-22 | 浙江三维通信科技有限公司 | Signal shielding detection method and system |
| CN111147158A (en) * | 2019-12-04 | 2020-05-12 | 杭州恒生数字设备科技有限公司 | Method for shielding multi-frequency WIFI signal |
| CN115225170A (en) * | 2022-08-01 | 2022-10-21 | 广州市瀚云信息技术有限公司 | Method and device for testing shielding effect of shielding device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098774A (en) * | 2010-12-24 | 2011-06-15 | 天津大学 | Energy-saving wireless local area network (WLAN) all-channel shielding method |
| CN202444497U (en) * | 2012-02-13 | 2012-09-19 | 江苏跨域信息科技发展有限公司 | Shielding system for preventing examination room wireless cheating |
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2017
- 2017-03-30 CN CN201710200110.6A patent/CN107425927A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098774A (en) * | 2010-12-24 | 2011-06-15 | 天津大学 | Energy-saving wireless local area network (WLAN) all-channel shielding method |
| CN202444497U (en) * | 2012-02-13 | 2012-09-19 | 江苏跨域信息科技发展有限公司 | Shielding system for preventing examination room wireless cheating |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108810952A (en) * | 2018-09-06 | 2018-11-13 | 桂林电子科技大学 | A kind of wireless communication signals interference prevention efficiency check and evaluation System and method for |
| CN110492952A (en) * | 2019-08-15 | 2019-11-22 | 浙江三维通信科技有限公司 | Signal shielding detection method and system |
| CN111147158A (en) * | 2019-12-04 | 2020-05-12 | 杭州恒生数字设备科技有限公司 | Method for shielding multi-frequency WIFI signal |
| CN115225170A (en) * | 2022-08-01 | 2022-10-21 | 广州市瀚云信息技术有限公司 | Method and device for testing shielding effect of shielding device |
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Application publication date: 20171201 |